As a long time WM1A user, here are some tips: 1. You are putting your files in the MUSIC folder in the root folder of your microSD card right? If you aren’t, the player won’t recognize your files at all. 2. Check if they show up under Unknown artist or a similar label. Sometimes the Sony OS shits itself and refuses to read ID3 tags from certain files. You may have to use software like dbpoweramp to retag them if this is the case. 3. If worst comes to worst, factory reset should do the job. You’ll lose your hour count but at least you should get your music to actually load. Hope this helps.